While Magnus wasn't an expert in relationships he knew it was more than just the fun things, he wanted to get to know Alec completely. Including what he considered 'silly stuff' but they would hopefully come to learn all that together. And discover the true meaning of being in a committed relationship.
"I'd like that very much" Magnus replied, part of him knew this was a bad idea. Dangerous really but he was drawn to Alec and there was nothing he could do about it. Pulling away wasn't an option so for now at least, he pushed their professional relationship to the back of his mind. Focusing on the now.